php man page for property_exists

PROPERTY_EXISTS(3)							 1							PROPERTY_EXISTS(3)

property_exists - Checks if the object or class has a property

SYNOPSIS
       bool property_exists (mixed  $class, string  $property)

DESCRIPTION
	This function checks if the given $property exists in the specified class.

       Note

	       As opposed with isset(3), property_exists(3) returns TRUE even if the property has the value NULL.

PARAMETERS
	      o $class
		- The class name or an object of the class to test for

	      o $property
		- The name of the property

RETURN VALUES
	Returns TRUE if the property exists, FALSE if it doesn't exist or NULL in case of an error.

NOTES
       Note

	      Using this function will use any registered autoloaders if the class is not already known.

       Note

	       The property_exists(3) function cannot detect properties that are magically accessible using the __get magic method.

CHANGELOG
       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  This function checks the existence of a property |
       |	| independent of accessibility. 		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES
       Example #1

	      A property_exists(3) example

	      <?php

	      class myClass {
		  public $mine;
		  private $xpto;
		  static protected $test;

		  static function test() {
		      var_dump(property_exists('myClass', 'xpto')); //true
		  }
	      }

	      var_dump(property_exists('myClass', 'mine'));   //true
	      var_dump(property_exists(new myClass, 'mine')); //true
	      var_dump(property_exists('myClass', 'xpto'));   //true, as of PHP 5.3.0
	      var_dump(property_exists('myClass', 'bar'));    //false
	      var_dump(property_exists('myClass', 'test'));   //true, as of PHP 5.3.0
	      myClass::test();

	      ?>

SEE ALSO
       method_exists(3).

PHP Documentation Group 													PROPERTY_EXISTS(3)